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adapter.go
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adapter.go
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package transformation
import (
"encoding/json"
corev1 "k8s.io/api/core/v1"
"knative.dev/eventing/pkg/reconciler/source"
"knative.dev/pkg/apis"
servingv1 "knative.dev/serving/pkg/apis/serving/v1"
commonv1alpha1 "github.com/zeiss/typhoon/pkg/apis/common/v1alpha1"
"github.com/zeiss/typhoon/pkg/apis/flow/v1alpha1"
common "github.com/zeiss/typhoon/pkg/reconciler"
"github.com/zeiss/typhoon/pkg/reconciler/resource"
)
const (
envTransformationCtx = "TRANSFORMATION_CONTEXT"
envTransformationData = "TRANSFORMATION_DATA"
)
// adapterConfig contains properties used to configure the target's adapter.
// Public fields are automatically populated by envconfig.
type adapterConfig struct {
// Configuration accessor for logging/metrics/tracing
obsConfig source.ConfigAccessor
// Container image
Image string `default:"ghcr.io/zeiss/typhoon/transformation-adapter"`
}
// Verify that Reconciler implements common.AdapterBuilder.
var _ common.AdapterBuilder[*servingv1.Service] = (*Reconciler)(nil)
// BuildAdapter implements common.AdapterBuilder.
func (r *Reconciler) BuildAdapter(trg commonv1alpha1.Reconcilable, sinkURI *apis.URL) (*servingv1.Service, error) {
typedTrg := trg.(*v1alpha1.Transformation)
return common.NewAdapterKnService(trg, sinkURI,
resource.Image(r.adapterCfg.Image),
resource.EnvVars(MakeAppEnv(typedTrg)...),
resource.EnvVars(r.adapterCfg.obsConfig.ToEnvVars()...),
), nil
}
// MakeAppEnv extracts environment variables from the object.
// Exported to be used in external tools for local test environments.
func MakeAppEnv(o *v1alpha1.Transformation) []corev1.EnvVar {
var trnContext string
if b, err := json.Marshal(o.Spec.Context); err == nil {
trnContext = string(b)
}
var trnData string
if b, err := json.Marshal(o.Spec.Data); err == nil {
trnData = string(b)
}
return []corev1.EnvVar{
{
Name: envTransformationCtx,
Value: trnContext,
},
{
Name: envTransformationData,
Value: trnData,
},
}
}